Take a look back at some of the more memorable casting changes in the history of television.
To fill the hole, Don Knotts was added as goofy new landlord Ralph Furley, who seemed to have a knack for walking in on Jack Tripper in compromising situations.
Enrique Castro-Mendivil / Reuters
U.S. National Archives
REUTERS/ Stefano Rellandini
U.S. Air Force
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